diff --git a/ToolHub.js b/ToolHub.js
index 1f13fe1..6c02fd0 100644
--- a/ToolHub.js
+++ b/ToolHub.js
@@ -1,13 +1,177 @@
 // ToolHub - 入口文件 (加载子模块并执行)
 // 将本文件放入 ShortX 任务，th_*.js 放入 ShortX 数据根目录/ToolHub/code/ 文件夹
 
+var MODULE_MANIFEST = {
+    "th_1_base.js": "1.0.0",
+    "th_2_core.js": "1.0.0",
+    "th_3_panels.js": "1.0.0",
+    "th_4_extra.js": "1.0.0",
+    "th_5_entry.js": "1.0.0"
+};
+
+var GIT_BASE = "https://git.xin-blog.com/chenziran/ShortX_ToolHub/raw/branch/main/code/";
+var __dirChecked = false;
+
+function getLogPath() {
+    return shortx.getShortXDir() + "/ToolHub/logs/init.log";
+}
+
+function writeLog(msg) {
+    try {
+        var f = new java.io.File(getLogPath());
+        var dir = f.getParentFile();
+        if (dir && !dir.exists()) {
+            dir.mkdirs();
+        }
+        var sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+        var ts = sdf.format(new java.util.Date());
+        var writer = new java.io.FileWriter(f, true);
+        writer.write("[" + ts + "] " + String(msg) + "\n");
+        writer.close();
+    } catch (e) {}
+}
+
+function runShell(cmdArr) {
+    try {
+        var proc = java.lang.Runtime.getRuntime().exec(cmdArr);
+        proc.waitFor();
+        return proc.exitValue() === 0;
+    } catch (e) {
+        return false;
+    }
+}
+
+function checkDirPerms(path) {
+    try {
+        var proc = java.lang.Runtime.getRuntime().exec(["stat", "-c", "%u %g %a", path]);
+        proc.waitFor();
+        var reader = new java.io.BufferedReader(new java.io.InputStreamReader(proc.getInputStream()));
+        var line = reader.readLine();
+        reader.close();
+        if (line) {
+            var parts = String(line).trim().split(/\s+/);
+            if (parts.length >= 3) {
+                var uid = String(parts[0]);
+                var gid = String(parts[1]);
+                var mode = String(parts[2]);
+                return uid === "1000" && gid === "1000" && mode === "700";
+            }
+        }
+    } catch (e) {}
+    return false;
+}
+
+function setDirPerms(path) {
+    runShell(["chmod", "700", path]);
+    runShell(["chown", "1000:1000", path]);
+}
+
+function downloadFile(urlStr, destFile) {
+    var url = new java.net.URL(urlStr);
+    var conn = url.openConnection();
+    conn.setConnectTimeout(10000);
+    conn.setReadTimeout(30000);
+    conn.setRequestProperty("User-Agent", "ShortX-ToolHub/1.0");
+    var code = conn.getResponseCode();
+    if (code !== 200) {
+        throw "HTTP " + code;
+    }
+    var expectedLen = conn.getContentLength();
+    var inStream = conn.getInputStream();
+    var outStream = new java.io.FileOutputStream(destFile);
+    var buf = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 8192);
+    var n;
+    var total = 0;
+    while ((n = inStream.read(buf)) !== -1) {
+        outStream.write(buf, 0, n);
+        total += n;
+    }
+    outStream.close();
+    inStream.close();
+    if (expectedLen > 0 && total !== expectedLen) {
+        throw "Size mismatch: expected=" + expectedLen + ", got=" + total;
+    }
+    var checkStream = new java.io.FileInputStream(destFile);
+    var checkBuf = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 200);
+    var checkRead = checkStream.read(checkBuf);
+    checkStream.close();
+    if (checkRead > 0) {
+        var prefix = new java.lang.String(checkBuf, 0, checkRead, "UTF-8");
+        if (prefix.indexOf("<!DOCTYPE") >= 0 || prefix.indexOf("<html") >= 0) {
+            throw "Downloaded content is HTML, not JS";
+        }
+    }
+    return total;
+}
+
+function getFileVersion(filePath) {
+    try {
+        var f = new java.io.File(filePath);
+        if (!f.exists()) return null;
+        var r = new java.io.BufferedReader(new java.io.InputStreamReader(new java.io.FileInputStream(f), "UTF-8"));
+        var line = r.readLine();
+        r.close();
+        if (line) {
+            var lineStr = String(line);
+            var idx = lineStr.indexOf("@version");
+            if (idx >= 0) {
+                var rest = lineStr.substring(idx + 8).trim();
+                var spaceIdx = rest.indexOf(" ");
+                var ver = spaceIdx >= 0 ? rest.substring(0, spaceIdx) : rest;
+                return ver;
+            }
+        }
+    } catch (e) {}
+    return null;
+}
+
 function loadScript(relPath) {
     try {
         var base = shortx.getShortXDir();
-        var f = new java.io.File(base + "/ToolHub/code/" + relPath);
-        if (!f.exists()) {
-            throw "Not found: " + f.getAbsolutePath();
+        var dir = new java.io.File(base + "/ToolHub/code/");
+
+        if (!__dirChecked) {
+            if (!dir.exists()) {
+                dir.mkdirs();
+                setDirPerms(dir.getAbsolutePath());
+                writeLog("Created dir: " + dir.getAbsolutePath());
+            } else if (!checkDirPerms(dir.getAbsolutePath())) {
+                setDirPerms(dir.getAbsolutePath());
+                writeLog("Fixed dir perms: " + dir.getAbsolutePath());
+            }
+            __dirChecked = true;
         }
+
+        if (!dir.canWrite()) {
+            throw "Dir not writable: " + dir.getAbsolutePath();
+        }
+
+        var f = new java.io.File(dir, relPath);
+        var expectedVer = MODULE_MANIFEST[relPath];
+        var localVer = getFileVersion(f.getAbsolutePath());
+        var needsDownload = !f.exists();
+
+        if (!needsDownload && expectedVer && localVer !== null && localVer !== expectedVer) {
+            needsDownload = true;
+            writeLog("Version mismatch for " + relPath + ": local=" + localVer + ", expected=" + expectedVer);
+        }
+
+        if (needsDownload) {
+            try {
+                var urlStr = GIT_BASE + relPath;
+                writeLog("Downloading " + relPath + " from " + urlStr);
+                var size = downloadFile(urlStr, f);
+                writeLog("Downloaded " + relPath + " (" + size + " bytes)");
+            } catch (dlErr) {
+                throw "Not found: " + f.getAbsolutePath() + ", download failed: " + dlErr;
+            }
+        }
+
+        var fileSize = f.length();
+        if (fileSize > 200 * 1024) {
+            writeLog("WARN: " + relPath + " is " + (fileSize / 1024) + "KB, consider splitting");
+        }
+
         var r = new java.io.BufferedReader(new java.io.InputStreamReader(
             new java.io.FileInputStream(f), "UTF-8"));
         var sb = new java.lang.StringBuilder();
@@ -23,11 +187,19 @@ function loadScript(relPath) {
     }
 }
 
-loadScript("th_1_base.js");
-loadScript("th_2_core.js");
-loadScript("th_3_panels.js");
-loadScript("th_4_extra.js");
-loadScript("th_5_entry.js");
+var modules = ["th_1_base.js", "th_2_core.js", "th_3_panels.js", "th_4_extra.js", "th_5_entry.js"];
+var loadErrors = [];
+for (var i = 0; i < modules.length; i++) {
+    try {
+        loadScript(modules[i]);
+    } catch (e) {
+        writeLog("Module load failed: " + modules[i] + " -> " + String(e));
+        loadErrors.push({ module: modules[i], err: String(e) });
+        if (modules[i] === "th_5_entry.js") {
+            throw "Critical module failed: " + modules[i];
+        }
+    }
+}
 
 var __out = (function() {
   var entryInfo = getProcessInfo("entry");
diff --git a/code/th_1_base.js b/code/th_1_base.js
index 80bae6c..b931cff 100644
--- a/code/th_1_base.js
+++ b/code/th_1_base.js
@@ -1,3 +1,4 @@
+// @version 1.0.0
 // ToolHub - Android 悬浮球工具 (ShortX / Rhino ES5)
 // 来源: 阿然 (xin-blog.com)
 //
diff --git a/code/th_2_core.js b/code/th_2_core.js
index 10fee89..f0e24bf 100644
--- a/code/th_2_core.js
+++ b/code/th_2_core.js
@@ -1,3 +1,4 @@
+// @version 1.0.0
 function FloatBallAppWM(logger) {
   this.L = logger || null;
 
diff --git a/code/th_3_panels.js b/code/th_3_panels.js
index 9aa4557..f333fa9 100644
--- a/code/th_3_panels.js
+++ b/code/th_3_panels.js
@@ -1,3 +1,4 @@
+// @version 1.0.0
 FloatBallAppWM.prototype.buildSettingsPanelView = function() {
   this.beginEditConfig();
 
diff --git a/code/th_4_extra.js b/code/th_4_extra.js
index a26bd7e..daf2f5e 100644
--- a/code/th_4_extra.js
+++ b/code/th_4_extra.js
@@ -1,3 +1,4 @@
+// @version 1.0.0
 FloatBallAppWM.prototype.buildViewerPanelView = function(titleText, bodyText) {
   var self = this;
   var isDark = this.isDarkTheme();
diff --git a/code/th_5_entry.js b/code/th_5_entry.js
index f09fbda..8a478ea 100644
--- a/code/th_5_entry.js
+++ b/code/th_5_entry.js
@@ -1,3 +1,4 @@
+// @version 1.0.0
 function runOnMainSync(fn, timeoutMs) {
   if (!fn) return { ok: false, error: "empty-fn" };
   try {